too long saddle??

I have a question.

I have a pony mare and we had a 16,5" seat saddle. But my trainer told me to get bigger one-that I cannot sit still in the small one and then my mare refuses to go relaxed.

I purchased synthetic light saddle, with 17"-17,5" seat.
We have been riding in I t for half a year and Liza is OK, no back soreness etc....

Is it too long for her?

From what I understood from saddlers videos etc, the weight put into the last part of the saddle is very small, the weight is the bigger in front part and decreases towards the back.....

It is the first saddle which doesnt cause her pain in few years. We tried several leather saddles, but since she is quite narrow around her whithers, we use medium gullet (mostly) in lenther saddles, but leather saddles with medium gullet are usually "round" on the part which touches the back-so she gets sore, because it puts most of the pressure in the centre and not front and back part.... (we call it here in czech that it "swings")... She seems quite satisfied under this saddle, eve the white spots from the last saddle totally disappeared while riding in this one. And she is that kind of a horse, which shows it when he is sore. Usually by taking me down while mounting
Is that right?

I forgot to metion, that the pressure of the saddle ends like two centimetres before the end of the saddle-the saddle is shaped "upwarss in the end"....

Well it doesn't look to big to me. Just remember that the saddle should not go past the last rib.

Wow! There are so many things going on outside 'standard' parameters I wouldn't know where to begin with comments. But here's a useful one -

If it aint broke, don't fix it :)

Name them, I will be purchasing a new (but similar) saddle soon. Maybe I will get itbetter I would love to know. Unfortunately, the saddlers here refuse to fit saddles to ponies. They tell me to get a bigger horse...

Is your horse is moving ok, then that is your answer. It LOOKS a bit long, but the pony says it's ok. You ride nicely balanced, not leaning back, and this is really important, too.

Well I have ridden her in 16,5" for three years so I got used to sitting in the forn part of the saddle. I didn't have problems sitting n that saddle, but my trainer told me to get bigger that it will do better weight-expansion for her back and I will sit more quietly... I thought 17,5" will be too ong, and this wrotten to be 17", but I think it is a little bit longer, but not 17,5" still...

When I raise to trot etc, I don't get my ass to the hind ....ehm.... most hind part of the saddle-a can always fit my hand (or almost all the hand) behind my butt...

We also ride bareback, but I heard it is not the best for the horse, too, and additionally, I am quite big and heavy and she is a small pony :(

But really, I look HUUUUUGE in tht jackets I have to find som pics in normal T-shirt

Okay - here's just a few. Please bear in mind these are just for information, not criticism.
(i) Saddle balance is wrong - it's biased too far forward (pommel is too low)
(ii) Saddle is too long - the rear panel is off the horse's back because of point (i). It is possible to have a shorter panel with the same tree-length
(iii) The pommel drops when the saddle is girthed up because either (a) the tree's too wide (unlikely, IMO) or (b) the panel needs stuffing to match the horse's shape (much more likely, IMO). From the pictures I also think the tree is a bit too curved to fit your horse's fairly flat back without flock alterations, though a shorter tree would probably fit a little better.

Your comment about saddlers is hilarious but unfortunately all too common. They're saddle retailers, not fitters :(

And to many eyes he is a bit small for you :)